MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Climbing film evaporators are _________ falling film evaporators. |
| A. | Better than |
| B. | Have more efficiency than |
| C. | Not as good as |
| D. | Considered over |
| Answer» D. Considered over | |
| 2. |
Which one of the following is not an advantage of climbing film evaporator? |
| A. | Low residence time |
| B. | High efficiency |
| C. | Low temperature difference required |
| D. | Low pressure operation |
| Answer» C. Low temperature difference required | |
| 3. |
Why are food, pharmaceuticals and sensitive fluids used in climbing tube evaporators? |
| A. | The pressure is very low |
| B. | There is very less temperature gradient |
| C. | The fluid is not exposed to high temperature for a long period of time |
| D. | Its heated by natural convection |
| Answer» D. Its heated by natural convection | |
| 4. |
What is the pressure used for thermal desalination of water in climbing film evaporators? |
| A. | Close to zero |
| B. | Very high around 3-4atm |
| C. | Atmospheric pressure |
| D. | Just below 1atm |
| Answer» B. Very high around 3-4atm | |
| 5. |
Which one of the following is not a use of climbing tube evaporator? |
| A. | Thermal desalination |
| B. | Juice concentration |
| C. | Pharmaceuticals |
| D. | Feed-water purification |
| Answer» E. | |
| 6. |
How does the fluid in climbing film evaporator rise in the tubes? |
| A. | There is a pump at the bottom that pushes it |
| B. | Pressure gradient is applied |
| C. | The vapour produced then pushes the fluid upward |
| D. | Temperature gradient causes convection that moves upward |
| Answer» D. Temperature gradient causes convection that moves upward | |
| 7. |
Climbing film evaporators are necessarily Long tube evaporators. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Which one of the following statements is correct about the nucleate boiling phenomenon in climbing tube evaporators? |
| A. | There is no nucleate boiling |
| B. | There is nucleate boiling throughout |
| C. | Nucleate boiling near the entrance but not later |
| D. | Nucleate boiling near the exit and nowhere else |
| Answer» D. Nucleate boiling near the exit and nowhere else | |
| 9. |
Which one of the following statement is incorrect about the factors leads to single effect operation of climbing film evaporator? |
| A. | When the vapour is contaminated and cannot be recycled |
| B. | The feed is highly corrosive, requiring expensive construction materials |
| C. | The liquid has low vapour pressure |
| D. | The energy cost to produce the steam heating is low |
| Answer» D. The energy cost to produce the steam heating is low | |
| 10. |
Climbing film evaporator can be used only as a single effect evaporator. |
| A. | True |
| B. | False |
| Answer» C. | |